Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes
Context. Gaia Data Release 1 (DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase. Aims. We give a brief overview of the astrometric content of the data...
| Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/127664 |
| Acceso en línea: | https://hdl.handle.net/2445/127664 |
| Access Level: | acceso abierto |
| Palabra clave: | Astrometria Mecànica celeste Astrometry Celestial mechanics |
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Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxesLindegren, LennartLammers, U.Bastian, U.Hernández, J.Klioner, S.Hobbs, D.Bombrun, A.Michalik, D.Ramos Lerate, M.Butkevich, A.Comoretto, G.Joliet, E.Holl, B.Hutton, A.Parsons, P.Steidelmüller, H.Abbas, U.Altmann, M.Andrei, A.Anton, S.Bach, N.Barache, C.Becciani, U.Berthier, J.Bianchi, L.Biermann, M.Bouquillon, S.Bourda, G.Brüsemeister, T.Bucciarelli, B.Busonero, D.Carlucci, T.Castañeda Pons, Javier BernardoCharlot, P.Clotet Altarriba, MarcialCrosta, M.Davidson, M.Felice, F. deDrimmel, R.Fabricius, ClausFienga, A.Figueras Siñol, FrancescaFraile, E.Gai, M.Garralda Torre, NoraGeyer, R.González Vidal, Juan JoséGuerra, R.Hambly, Nigel C.Hauser, M.Jordan, S.Lattanzi, M. G.Lenhardt, H.Liao, S.Löffler, W.McMillan, P. J.Mignard, F.Mora, A.Morbidelli, R.Portell i de Mora, JordiRiva, A.Sarasso, M.Serraller, I.AstrometriaMecànica celesteAstrometryCelestial mechanicsContext. Gaia Data Release 1 (DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase. Aims. We give a brief overview of the astrometric content of the data release and of the model assumptions, data processing, and validation of the results. Methods. For stars in common with the Hipparcos and Tycho-2 catalogues, complete astrometric single-star solutions are obtained by incorporating positional information from the earlier catalogues. For other stars only their positions are obtained, essentially by neglecting their proper motions and parallaxes. The results are validated by an analysis of the residuals, through special validation runs, and by comparison with external data. Results. For about two million of the brighter stars (down to magnitude ∼11.5) we obtain positions, parallaxes, and proper motions to Hipparcos-type precision or better. For these stars, systematic errors depending for example on position and colour are at a level of ±0.3 milliarcsecond (mas). For the remaining stars we obtain positions at epoch J2015.0 accurate to ∼10 mas. Positions and proper motions are given in a reference frame that is aligned with the International Celestial Reference Frame (ICRF) to better than 0.1 mas at epoch J2015.0, and non-rotating with respect to ICRF to within 0.03 mas yr−1 . The Hipparcos reference frame is found to rotate with respect to the Gaia DR1 frame at a rate of 0.24 mas yr−1 . Conclusions. Based on less than a quarter of the nominal mission length and on very provisional and incomplete calibrations, the quality and completeness of the astrometric data in Gaia DR1 are far from what is expected for the final mission products. The present results nevertheless represent a huge improvement in the available fundamental stellar data and practical definition of the optical reference frame.EDP Sciences2019201920162019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/127664Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1051/0004-6361/201628714Astronomy & Astrophysics, 2016, vol. 595https://doi.org/10.1051/0004-6361/201628714(c) The European Southern Observatory (ESO), 2016info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1276642026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes |
| title |
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes |
| spellingShingle |
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes Lindegren, Lennart Astrometria Mecànica celeste Astrometry Celestial mechanics |
| title_short |
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes |
| title_full |
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes |
| title_fullStr |
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes |
| title_full_unstemmed |
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes |
| title_sort |
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes |
| dc.creator.none.fl_str_mv |
Lindegren, Lennart Lammers, U. Bastian, U. Hernández, J. Klioner, S. Hobbs, D. Bombrun, A. Michalik, D. Ramos Lerate, M. Butkevich, A. Comoretto, G. Joliet, E. Holl, B. Hutton, A. Parsons, P. Steidelmüller, H. Abbas, U. Altmann, M. Andrei, A. Anton, S. Bach, N. Barache, C. Becciani, U. Berthier, J. Bianchi, L. Biermann, M. Bouquillon, S. Bourda, G. Brüsemeister, T. Bucciarelli, B. Busonero, D. Carlucci, T. Castañeda Pons, Javier Bernardo Charlot, P. Clotet Altarriba, Marcial Crosta, M. Davidson, M. Felice, F. de Drimmel, R. Fabricius, Claus Fienga, A. Figueras Siñol, Francesca Fraile, E. Gai, M. Garralda Torre, Nora Geyer, R. González Vidal, Juan José Guerra, R. Hambly, Nigel C. Hauser, M. Jordan, S. Lattanzi, M. G. Lenhardt, H. Liao, S. Löffler, W. McMillan, P. J. Mignard, F. Mora, A. Morbidelli, R. Portell i de Mora, Jordi Riva, A. Sarasso, M. Serraller, I. |
| author |
Lindegren, Lennart |
| author_facet |
Lindegren, Lennart Lammers, U. Bastian, U. Hernández, J. Klioner, S. Hobbs, D. Bombrun, A. Michalik, D. Ramos Lerate, M. Butkevich, A. Comoretto, G. Joliet, E. Holl, B. Hutton, A. Parsons, P. Steidelmüller, H. Abbas, U. Altmann, M. Andrei, A. Anton, S. Bach, N. Barache, C. Becciani, U. Berthier, J. Bianchi, L. Biermann, M. Bouquillon, S. Bourda, G. Brüsemeister, T. Bucciarelli, B. Busonero, D. Carlucci, T. Castañeda Pons, Javier Bernardo Charlot, P. Clotet Altarriba, Marcial Crosta, M. Davidson, M. Felice, F. de Drimmel, R. Fabricius, Claus Fienga, A. Figueras Siñol, Francesca Fraile, E. Gai, M. Garralda Torre, Nora Geyer, R. González Vidal, Juan José Guerra, R. Hambly, Nigel C. Hauser, M. Jordan, S. Lattanzi, M. G. Lenhardt, H. Liao, S. Löffler, W. McMillan, P. J. Mignard, F. Mora, A. Morbidelli, R. Portell i de Mora, Jordi Riva, A. Sarasso, M. Serraller, I. |
| author_role |
author |
| author2 |
Lammers, U. Bastian, U. Hernández, J. Klioner, S. Hobbs, D. Bombrun, A. Michalik, D. Ramos Lerate, M. Butkevich, A. Comoretto, G. Joliet, E. Holl, B. Hutton, A. Parsons, P. Steidelmüller, H. Abbas, U. Altmann, M. Andrei, A. Anton, S. Bach, N. Barache, C. Becciani, U. Berthier, J. Bianchi, L. Biermann, M. Bouquillon, S. Bourda, G. Brüsemeister, T. Bucciarelli, B. Busonero, D. Carlucci, T. Castañeda Pons, Javier Bernardo Charlot, P. Clotet Altarriba, Marcial Crosta, M. Davidson, M. Felice, F. de Drimmel, R. Fabricius, Claus Fienga, A. Figueras Siñol, Francesca Fraile, E. Gai, M. Garralda Torre, Nora Geyer, R. González Vidal, Juan José Guerra, R. Hambly, Nigel C. Hauser, M. Jordan, S. Lattanzi, M. G. Lenhardt, H. Liao, S. Löffler, W. McMillan, P. J. Mignard, F. Mora, A. Morbidelli, R. Portell i de Mora, Jordi Riva, A. Sarasso, M. Serraller, I. |
| author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Astrometria Mecànica celeste Astrometry Celestial mechanics |
| topic |
Astrometria Mecànica celeste Astrometry Celestial mechanics |
| description |
Context. Gaia Data Release 1 (DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase. Aims. We give a brief overview of the astrometric content of the data release and of the model assumptions, data processing, and validation of the results. Methods. For stars in common with the Hipparcos and Tycho-2 catalogues, complete astrometric single-star solutions are obtained by incorporating positional information from the earlier catalogues. For other stars only their positions are obtained, essentially by neglecting their proper motions and parallaxes. The results are validated by an analysis of the residuals, through special validation runs, and by comparison with external data. Results. For about two million of the brighter stars (down to magnitude ∼11.5) we obtain positions, parallaxes, and proper motions to Hipparcos-type precision or better. For these stars, systematic errors depending for example on position and colour are at a level of ±0.3 milliarcsecond (mas). For the remaining stars we obtain positions at epoch J2015.0 accurate to ∼10 mas. Positions and proper motions are given in a reference frame that is aligned with the International Celestial Reference Frame (ICRF) to better than 0.1 mas at epoch J2015.0, and non-rotating with respect to ICRF to within 0.03 mas yr−1 . The Hipparcos reference frame is found to rotate with respect to the Gaia DR1 frame at a rate of 0.24 mas yr−1 . Conclusions. Based on less than a quarter of the nominal mission length and on very provisional and incomplete calibrations, the quality and completeness of the astrometric data in Gaia DR1 are far from what is expected for the final mission products. The present results nevertheless represent a huge improvement in the available fundamental stellar data and practical definition of the optical reference frame. |
| publishDate |
2016 |
| dc.date.none.fl_str_mv |
2016 2019 2019 2019 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2445/127664 |
| url |
https://hdl.handle.net/2445/127664 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Reproducció del document publicat a: https://doi.org/10.1051/0004-6361/201628714 Astronomy & Astrophysics, 2016, vol. 595 https://doi.org/10.1051/0004-6361/201628714 |
| dc.rights.none.fl_str_mv |
(c) The European Southern Observatory (ESO), 2016 info:eu-repo/semantics/openAccess |
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(c) The European Southern Observatory (ESO), 2016 |
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openAccess |
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application/pdf |
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EDP Sciences |
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EDP Sciences |
| dc.source.none.fl_str_mv |
Articles publicats en revistes (Física Quàntica i Astrofísica) reponame:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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